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https://issues.apache.org/jira/browse/AIRFLOW-5539?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guru Devanla updated AIRFLOW-5539:
----------------------------------
Priority: Minor (was: Major)
> default_args dictionary is mutated when passed as arugment to Airflow
> ---------------------------------------------------------------------
>
> Key: AIRFLOW-5539
> URL: https://issues.apache.org/jira/browse/AIRFLOW-5539
> Project: Apache Airflow
> Issue Type: Bug
> Components: DAG
> Affects Versions: 1.10.3
> Environment: Python 3.7.4, Linux
> Reporter: Guru Devanla
> Priority: Minor
>
> The `default_args` argument is a dictionary that can be passed into the DAG
> constructor while constructing a dag. But, using the same variable to
> construct multiple DAGS breaks, since the `default_args` argument is mutated.
> Here is a minimal example:
>
> {code:java}
> // code placeholder
>
> In [20]: default_args=dict(start_date=datetime.datetime(2019, 8, 1))
>
> In [21]: default_dag=DAG(dag_id='test', default_args=default_args)
>
>
> In [23]: default_args['start_date'].tzinfo is None
>
> Out[23]: True
> In [24]: d1=default_dag() # construct the DAG.
> # Now check the value in default_args.
>
> In [25]: default_args['start_date'].tzinfo is None
>
> Out[25]: False
> In [26]:
> {code}
>
> My guess is that the deepcopy call to copy default_args is not working
> properly.
>
> I am using Python 3.7.4.
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